Phase Equilibria in Synthetic Coal鈥揚etcoke Slags (Al2O3鈥揅aO鈥揊eO鈥揝iO2鈥揤2O3) under Simulated Gasification Conditions

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• 作者：Jinichiro Nakano ; Kyei-Sing Kwong ; James Bennett ; Thomas Lam ; Laura Fernandez ; Piyamanee Komolwit ; Seetharaman Sridhar
• 刊名：Energy & Fuels
• 出版年：2011
• 出版时间：July 21, 2011
• 年：2011
• 卷：25
• 期：7
• 页码：3298-3306
• 全文大小：1056K
• 年卷期：v.25,no.7(July 21, 2011)
• ISSN：1520-5029

文摘

Phase equilibria of the Al₂O₃鈥揅aO鈥揊eO鈥揝iO₂鈥揤₂O₃ system in synthetic slag mixtures simulating coal鈥損etcoke slag chemistry at 1500 掳C in an oxygen partial pressure of 10^鈥? atm were investigated by a series of quench experiments. Quenched samples were analyzed by inductively coupled plasma optical emission spectrometry (ICP), X-ray diffractometry (XRD), transmission electron microscopy (TEM), and wavelength dispersive X-ray (WDX). Two precipitated crystal phases were identified in molten slags: mullite (3Al₂O₃路2SiO₂) in Al₂O₃-rich slags and karelianite (V₂O₃) in V₂O₃-rich slags. Scanning electron microscopy and TEM diffraction patterns confirmed the presence of the mullite and karelianite phases. On the basis of experimental results, an isothermal phase diagram of the Al₂O₃鈥揅aO鈥揊eO鈥揝iO₂鈥揤₂O₃ system at 1500 掳C and P_O2 = 10^鈥? atm is proposed while keeping CaO = 7.0 wt % and FeO = 13.5 wt %.